Abnormal isotopic shift of the broad band in the Mg1-xAlx10,11B2 superconductor

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dc.contributor.author Parisiades, P en
dc.contributor.author Lampakis, D en
dc.contributor.author Palles, D en
dc.contributor.author Liarokapis, E en
dc.contributor.author Simonelli, L en
dc.contributor.author Bianconi, A en
dc.date.accessioned 2014-03-01T01:25:51Z
dc.date.available 2014-03-01T01:25:51Z
dc.date.issued 2007 en
dc.identifier.issn 09214534 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/17776
dc.subject MgB2 en
dc.subject Phonons en
dc.subject Raman scattering en
dc.subject Superconductivity en
dc.subject.other Magnesium compounds en
dc.subject.other Phonons en
dc.subject.other Polycrystalline materials en
dc.subject.other Raman scattering en
dc.subject.other Isotopic shift en
dc.subject.other Polycrystalline compounds en
dc.subject.other Superconductivity en
dc.title Abnormal isotopic shift of the broad band in the Mg1-xAlx10,11B2 superconductor en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.physc.2007.04.124 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.physc.2007.04.124 en
heal.publicationDate 2007 en
heal.abstract We have studied the effect of aluminum doping and boron isotopic substitution on the Raman spectra of the Mg1-xAlx10,11B2 polycrystalline compounds. Our data show that new peaks appear at ∼740 and 870 cm-1 while the broad band at ∼600 cm-1 diminishes for higher Al doping levels. The high energy band evolves to the E2g phonon mode of AlB2 corresponding to a strong reduction in the electron-phonon coupling. The isotopic shift for the broad band at ∼600 cm-1 is small considering the isotopic shift of the other bands, which follow the harmonic mass law. This extreme anharmonic behavior indicates that the broad band may not be directly related with the E2g phonon of the B atoms. © 2007 Elsevier B.V. All rights reserved. en
heal.journalName Physica C: Superconductivity and its Applications en
dc.identifier.doi 10.1016/j.physc.2007.04.124 en
dc.identifier.volume 460-462 I en
dc.identifier.issue SPEC. ISS. en
dc.identifier.spage 612 en
dc.identifier.epage 613 en

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